Traveling grate.



M. W. 'SEWALL.

TRAVELING GRATE. APPLICATION men ran. 3. 1913.

Patented Oct. 3

MINOTT W. SEWALL, OF NEW YORK, N. Y ASSIGNOR TO THE BABCOGK & WILCOX.COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TRAVELING GRATE.

Specification of Letters Patent.

Patented Oct. 3, 1916.

To all whom it may concern Be it known that I, Mmo'r'r W. SEWALL, a

. citizen of the United States, residing at New York city, borough ofManhattan, in the county of New York and State of New York, haveinvented certain new and useful Improvements in Traveling Grates, ofwhich the followingis a specification.-

My invention relates to traveling grates. As at present built, chain ortraveling grates are usually mounted on a frame carried on wheels toenable the whole structure to be withdrawn from the furnace, in orderthat the repairs may be made to it. This has the advantage of making allpartsaccessible, or, if it is drawn only part way, of making such partof it accessible as is withdrawn. Among the disadvantages attending theusual construction may be enumerated the following: (1) The stoker partsare inaccessible whenin place for operation; (2) If thestoker be a longone, great width of tire room is required; (3) The stoker frame,together with the supporting rail beams and pit between them, involveconsiderable expense; (4) There is a diiiioulty' in replacing links dueto the longlink rods,

, sive to the customer, outside of the stoker especially if the boilersbe in battery without excessively thick center walls; (5) The necessaryconservation hoppers are expencosts; (6) A broken link sometimes breaksanother part of the stoker before it is discovered or replaced; (7) Thedriving parts if properly protected from fire room dust are expensive;(8) The driving rig is mounted on the stoker frame and therefore mustbeeasily detachable from the driving parts, common to-all of the stokersin the boiler plant or unit.

The object of the present invention is to overcome, so far as may be,the above mentioned disadvantages, and will be understood by referenceto the accompanying drawings in which,

Figure 1 is a vertical longitudinal sect on of a furnace and travelinggrate; Fig. 2, av transverse section on the plane of the line 2 2 ofFig. 15' Fig, 3, a, transverse section on the plane of the line 33 ofFig. 1, and Fig. 4, a partial sectional plan on the plane of the line 44of- Fig. 1.

Similar reference "numerals indicate simi larparts in the severalviews...

Referring to the drawings the numeral :1

designates the furnace space of a steam boiled'in which the grate isplaced, suflicient parts of the side walls and of the boiler settingbeing shown to facilitate an understanding of the application of thepresent invention. The lower side walls of the furnace are protected byawater cooling system described in my application Serial'No. 69 9, 860,filed May 27, 1912, this system comprising side water tubes 2 and sidewater boxes 8. Cross boxes 42 and 5 form the bridge wall of the furnace,said tubes and boxes being connected with the boiler circulation.

The traveling grate-which I have shown for the purpose of describing myinvention conslstsof a grate surface made up of interlocking links 6held in position by rods 7. Short link rods may be used which can bedriven out into the space under the center wall by working in thepassage way, enabling all links to be replaced 0.- the drag way insteadof in front if preferred.

The fuel support consists of an endless web or belt passing aroundsprocket wheels 8 and 9, said wheels being mounted on shafts supported1n suitable bearings. Fig. 3 shows the rear sprocket shaft 10 with oneof its bearings 11. 'A screw jack 12 may be I used for raising orlowering the shaft, the

lower bearing of said jack restingon the.

' in bars 15, the latter beingnotched on their upper edges'to receivethe rods. The bars 15 are attached to vertical supports 16 and these inturn are secured throughplates 17 to vertical supports 18, which latterare the supports for the boiler casing plates. By this construction sidewalls below the grate line are not required, plates installed forclosing the space in, being substituted. v

The side water boxes 3 are spaced apart at least the distance of thewidth of the grate,

and the bottoms of the boxes are slightly above the upper surface of thegrate. As shown in Figs. 2 and 3 these boxes are partially supportedupon angle bars 25 secured to the vertical supports 16, said barsextending longitudinally along the sides of the grate links and servingto close the air space between the grate and the side water boxes.

For the lower or return run of the grate I provide a floor 19independent of the grate structure an? upon which the return run restsas it is drawn to the front of the furnace. turn run of the gratebetween the sprockets is longer than the upper .or forward run of thegrate between the sprockets so as to sa and conform to the shape of thefioor over which it travels. This floor may be constructed in anysuitable manner and. of suitable material, such as concrete or with asur face of concrete or similar building stuff, and is a part of thebuilding structure, that is, it constitutes the furnace floor and isprepared as a part of the installation and is independent of the gratestructure. It may lie in a horizontal plane, or may be inclineddownwardly or upwardly from the rear to the front. As shown it begins ashort distance in front of the rear sprocket wheels and terminates nearthe front of the furnace opening. that of the grate. To prevent unduewear of the floor 1 may embed therein metal strips 20. As the return runrests directly upon the floor I may install anti-friction wheels 21built into the floor to reduce the friction.

Below the forward or discharge end of the floor 19 is a belt or otaercarrier 22 for conveying the sittings brought forward by the return runof the grate, these siftings falling through the upper run of the grateupon the floor.

From the foregoing description it will be seen that the usual practiceof removing the stoker from under the boiler for repairs has beenabandoned, there being sufiieient space between the upper and lower runsof the chain allowed for a man to enter for access As shown in Fig. 1the lower or rc-.

Its width is substantially to all parts of the interior of the stolier,and to the inner ends of the rear shafts when a battery setting is used,by entering the space between the stokers under the center wall of thebattery.

A shield 23 prevents refuse from "falling under the rear end of thegrate and directs it to an auxiliary grate 24-.

What I claim and desire to secure by Let-- ters Patent of the UnitedStates is l. A traveling grate having a fuel-supporting surface,sprocket wheels around which the grate travels and a supporting floorfor the lower or return run. the lower or return run of the gratebetween the sprockets being longer than the intiper or for ward run ofthe grate between the sprocl-iets so as to sag and conform. to the shapeof tho floor over which it travels.

2. A traveling grate having a ituelsiupporting surface, sprocket wheelsround which the grate travels, and a. sup iiorting floor for the loweror return run. said iioor sloping upward from the rear to the front, thelower or return run of the grate between the sprockets being longer thanthe upper or forward run of the grate between the sprockets so as to sagand conform to the shape of the floor over which it travels.

-3. A traveling grate having a fur porting surface. sprocket who whichthe grate travels. a support for the lower or return run, said floorsloping upward from the rear to the front and having metallic wearmembers, the lower or return run of the grate between the spro ets beinglonger than the upper or forward run of the grate between the spree retsso as to sag and conform to the shape of the iioor over which ittravels;

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses.

Witnesses J. E. BELL, Jenn A. W. DIXON.

